One vertex per element, one color per generator, with an edge from x to x·s.
(9,10)(11,15)(12,16)(13,14)(17,18)(19,25)(20,31)(21,27)(22,32)(23,28)(24,29)(26,30) involution — undirected(1,2)(3,5)(4,6)(7,8)(10,14)(11,16)(17,19,24,22)(18,25,29,32)(20,23,30,27)(21,31,28,26)(1,2,4,6)(3,5,7,8)(9,11)(10,12)(13,16)(14,15)(17,20)(18,26)(19,23)(21,25)(22,27)(24,30)(28,32)(29,31)(3,7)(5,8)(9,11)(10,12)(13,16)(14,15)(17,21,24,28)(18,27,29,23)(19,26,22,31)(20,25,30,32)(1,2)(3,5)(4,6)(7,8)(9,12)(10,11)(13,15)(14,16)(17,22,24,19)(18,25,29,32)(20,27,30,23)(21,31,28,26)(1,3)(2,5)(4,7)(6,8)(17,23,24,27)(18,28,29,21)(19,30,22,20)(25,26,32,31)A Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.